android中图片倒影、圆角效果重绘

本文用来记录一些Android 操作图片的方法，方便查看。

1.将Drawable转化为Bitmap

public static Bitmap drawableToBitmap(Drawable drawable){
 int width = drawable.getIntrinsicWidth();
 int height = drawable.getIntrinsicHeight();
 Bitmap bitmap = Bitmap.createBitmap(width, height,
 drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
 : Bitmap.Config.RGB_565);
 Canvas canvas = new Canvas(bitmap);
 drawable.setBounds(0,0,width,height);
 drawable.draw(canvas);
 return bitmap;
 }

2.获得圆角图片的方法

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){

 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
 .getHeight(), Config.ARGB_8888);
 Canvas canvas = new Canvas(output);

 final int color = 0xff424242;
 final Paint paint = new Paint();
 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
 final RectF rectF = new RectF(rect);

 paint.setAntiAlias(true);
 canvas.drawARGB(0, 0, 0, 0);
 paint.setColor(color);
 canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
 canvas.drawBitmap(bitmap, rect, rect, paint);

 return output;
 }

3.获得带倒影的图片方法

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